DE602004004696T2 - Gearbox with a worm shaft for roller shutters - Google Patents

Abstract

The gear has a toothed wheel driven by a cylindrical worm gear (2) and connected to a rolling tube of a shutter by rigid fasteners. The rotation of a screw is controlled by a control rod (7) connected to a crank. The worm gear moves towards a compartment (6) of a casing (1) when turned by actuating a descent of the shutter and when a wheel gear (3) does not turn in this direction.

Description

The The present invention relates to a compact housing suitable for driving a Roller shutter includes a gearbox with wheel and tangential screw.

The Document US-A-4372367 discloses a housing according to the preamble of Claim 1 corresponds.

you White, that the actuation a shutter over a manually controlled gearbox that controls the rotation of the roll tube drives positively in both directions, always carries the danger that, when the roller shutter is lowered and opened by the operator should, this turns the roll tube in the wrong direction and the Blinds hanging upside down on this tube. The end the rolling of the roller shutter must therefore be characterized in a way the continuation the rotation about it prevented. On the other hand, there is one due to its low Space requirements very often used mechanism in a gearbox with wheel and tangent Snail in which the snail is one with a flywheel actuated by a crank connected rod with the wheel being the roll-up tube at a rotational speed which is lower than the rotational speed of the Slug.

at Such conventionally constructed transmissions will prevents wrong operating direction by blocking the wheel which drives the roll-up tube, and not the wheel driving this Slug. This method was chosen because the blocking devices Count revolutions only limited and therefore the limit stop the rotation of the component of the Gearbox must stop that rotates the slowest and transmits the highest torque. Out That's why it happens frequently to a progressive caulking the attack or a deformation of the housing, because the stop signal is not always clearly perceived by the operator That's why it can happen that he is continuing the process forces in the wrong direction.

On the other side is now common requires that manually controlled shutters provide a gearbox with irreversible motion transmission have this, with the help of special anchoring elements, which connect the curtain of the shutter with the roll tube, in closed position holds. These anchorages are rigid and anchored by the Roller shutter track or the curtain, when it is lowered, block, which prevents it from being lifted directly.

There is one for that Good coordination of the function of the limit stop with a corresponding position anchorages necessary. However, the attack acts in one Angular position of the roll-up tube, only by change the connection of the pipe end with the transmission is variable. For this Change, the one big one Angle variation entails the tube must be dismantled. Out For this reason, the pipe must be in a reasonable approach position be mounted, and the connection of the anchorages with the roll tube must adjustable at least in a certain peripheral region of the tube be. Such anchors cause the assembly of the shutter complicated will, as well they are expensive.

On the other side need rigid anchorages whose attachment to the pipe is not adjustable is, gear without end positions, but are not always in the self Able to ensure the function blockade of the operation, as its length is gradual varies, as well as the height the hangings, being unfavorable Combinations of these two variables into an incomplete blockade to lead, generally the higher one Moment that transmitted from the transmission can not resist.

The Invention solves these difficulties for the special case of gears with wheel and tangential screw, which control a roller shutter without relief spring.

As from attached Claim 1 defines the screw according to the invention according to its axis crossed by a staff that controls their rotation directly, and its main feature is that this snail according to the axis the control rod moves when it causes the lowering, wherein the wheel is no longer driven by the roll-up, in this To turn direction or at the most is blocked.

• – die Aufnahme der Schnecke im Gehäuse zwei miteinander kommunizierende Fächer aufweist, eines, in dem die Schnecke frei drehen kann, wenn sie dort ist, wobei das andere Fach derart mit einem Gewinde versehen ist, das es für die Schnecke eine nicht durchbrechende Mutter ausbildet, in welche die auf dem Steuerstab gleitende Schnecke eingreift, wenn dieser Stab in Richtung des Herablassens dreht, wobei das Rad nicht mehr von dem Aufrollrohr angetrieben wird, sich in diese Richtung zu drehen,
• – die Schnecke, wenn sie dreht und dabei das Herablassen bewirkt, in dem zylindrischen Fach ihrer Aufnahme von einem Rückhaltemittel zurückgehalten werden kann, das loslässt, wenn das Rad blockiert und sich das vom Steuerstab auf die Schnecke ausgeübte Moment in eine ausreichende Axialkraft umwandelt,
• – die Schnecke eine halsförmige Aussparung aufweisen kann, die in einer Verdickung endet, wobei diese zwischen den Schenkeln eines elastischen Reiters festgespannt ist, der lösbar und wieder aufsetzbar ist, ohne das Gehäuse demontieren zu müssen, wobei dieser Reiter das Mittel bildet, mit welchem die Schraube bzw. Schnecke lösbar in dem zylindrischen Fach ihrer Aufnahme zurückgehalten wird,
• – die Bremse, die dem statischen Moment des Behangs entgegenwirkt, nicht auf die Schnecke wirken kann, aber direkt auf den Steuerstab.

A particular embodiment may be that the worm is driven directly by the control rod, in which case:

• The housing of the worm in the housing has two communicating compartments, one in which the worm can rotate freely when it is there, the other compartment being threaded in such a way that it forms a non-breaking nut for the worm, into which the worm sliding on the control rod engages when this rod rotates in the direction of lowering, the wheel being no longer driven by the roll-up tube to rotate in that direction,
• The worm, when rotating while causing it to descend, can be retained in the cylindrical compartment of its receptacle by a retaining means which releases when the wheel is locked and that from the control rod is blocked Worm torque converted into a sufficient axial force,
• - The worm may have a neck-shaped recess which ends in a thickening, which is clamped between the legs of a resilient rider, which is releasable and replaceable without having to dismantle the housing, said rider forms the means with which the Screw or worm is releasably retained in the cylindrical compartment of its receptacle,
• - The brake, which counteracts the static moment of the curtain, can not act on the screw, but directly on the control rod.

One Casing, that is not covered by the claims is, that on the one hand the brake, the static Moment, which is due to the weight of the blind, counteracts, directly acting on the control rod and not on the worm, being the worm on the other hand with a to her over its edge-connected cylinder cooperates with a lock radial toothing to form, the whole construction of the control rod is crossed, which drives only the cylinder, wherein this cylinder positively transfers rotation of a rod to a screw when this causes the lifting of the blind and jerks off the snail by sliding on the rod, when the rod causes the lowering, the wheel is not in this Can turn direction.

• – kann das Mittel, das dem vom Behang erzeugten statischen Moment entgegenwirkt, darin bestehen, in eine Öffnung des Gehäuses, durch die der Steuerstab verläuft, eine Muffe mit doppeltem Rand einzusetzen, wobei die Ränder an der einen und der anderen Seite der Öffnung positioniert sind, wobei die Muffe von dem Stab durchquert wird und mit diesem rotierend verbunden ist, wobei ein Ring aus einem elastischen Material zwischen dem Muffenkörper und der Innenwand der Öffnung komprimiert wird,
• – kann die Bremsvorrichtung eine Feder mit einigen Windungen sein, die mit einem ihrer Enden mit dem Gehäuse verbunden ist und die mit Spannung einen Metallzylinder umgibt, der von dem Steuerstab durchquert wird und von ihm angetrieben.

Finally and independently of the embodiment:

• The means counteracting the static moment produced by the curtain may be to insert into a mouth of the housing through which the control rod passes a double-skirted sleeve, the edges being positioned on one and the other side of the aperture wherein the sleeve is traversed and rotationally connected by the rod, a ring of resilient material being compressed between the sleeve body and the inner wall of the aperture;
• - The braking device may be a spring with a few turns, which is connected at one of its ends to the housing and the voltage surrounding a metal cylinder which is traversed by the control rod and driven by him.

The Drawings in the annex illustrate the invention:

The 1 shows a gearbox whose worm automatically locks when the shutter is lowered completely.

The 2 shows a variant which is not supported by the following claims, which according to the worm not blocked, but automatically disengages when the shutter is lowered completely.

In front explanation the drawings will be here first referred to some conditions, the gear with gear and Meet snail have to, if they are to operate shutters be used.

Just, if the roller shutter has no relief spring, means a No longer acting moment on the wheel, that the shutter lowered completely is. In this downward movement the task of the transmission is essentially the hanging restrain but it can also keep this half open and must prevent his weight from spontaneous rotation of the Control organ leads. Often, some precautions are taken to prevent that the transmission is irreversible on its own: this is on the one hand to avoid the speed of the wheel in terms of the Speed of the screw is reduced too much, and on the other hand is To reduce the thickness of the transmission maximally, and eventually for cost reasons primarily wheels and plastic screws that can be molded are used. So that these three prerequisites can be met, are Snails with multi-course Threads with a small diameter and a large tooth module to use. This affects the resulting helix angle on irreversibility unfavorable out. However, due to the robustness of the devices, it is too substantial Frictions comes, are a helix angle of about 20 ° and a moderate Braking effect of the screw sufficient to make the gear irreversible is because the sent back by the wheel to the control rod moment considerably is below the moment, the maximum of the curtain is exercised on the wheel.

The explanation is now the 1 that in half of its dismantled housing 1 placed gear shows.

The directions of rotation of the screw 2 are clearly connected to the directions in which the curtain not shown here is raised and lowered, the direction of lifting of the arrow on the wheel 3 is shown. The shot of the snail 2 in the case 1 includes a cylindrical compartment 4 into which the toothed section of the wheel 3 engages in the thread of the screw 2 intervenes. The threads of the screw 2 supported on the cylindrical wall of the compartment 4 which is slightly longer than the threaded portion of the screw 2 , The wheel 3 turns and gets protrusions 5 in the case 1 guided. The recording of slug 2 extends towards another compartment 6 which, in turn, is threaded so that the worm can partially engage there when it is caused to shift towards that compartment.

The snail 2 , which refer to the drawing in the cylindrical compartment 4 her intake is in working position to effect lifting, which she can do indefinitely. To lower it stops in this compartment 4 as soon as she gets off the bike 3 is retained there due to the moment generated by the weight of the curtain. This moment acting in the opposite direction of the arrow with which the wheel 3 by itself, the auger tends to do so 2 towards the bottom of the tray 4 push back.

When the curtain is lowered completely, the wheel becomes 3 passive, and the snail 2 moves due to the general inertia of the design, being with its thread on the teeth of the motionless wheel 3 moving forward, towards the tray 6 of her admission, which is opposite to the subject which she took. During this movement, the snail slides 2 whose central recess is the polygonal shape of the control rod 7 corresponds, on this bar 7 , and if they are the bottom of the threaded compartment 6 has blocked it and transfers that effect to the control rod 7 ,

Otherwise it exists an interest in adapting the gearbox to different roller shutter configurations to be able to because, as has already been said, some roller shutters with rigid anchorages themselves close, by connecting their curtain with the roll-up tube, others, however simply hooked with straps or elastic metal slats. at the first named must have a certain, after the unrolling of the blind affect the lowered moment to the anchorages in the other case, this moment is harmful.

Such an adaptation of the transmission is carried out by an elastic tab 8th in a compartment 9 of the housing 1 housed, which is equipped with two opposite slots, which allow the rider 8th to introduce or remove there without having to dismantle or disassemble the housing. This rider 8th is longer than the compartment 9 His legs are bent and he is at rest, the shape in which he is clipped into his compartment.

The rider 8th is in a vertical plane to the axis of the screw 2 being positioned, being his compartment 9 the outward leading mouth 10 of the cylindrical compartment 4 the inclusion of the snail 2 crosses. The distance between the thighs of the rider 8th is smaller than the mouth of the mouth 10 against which it is positioned, this opening being from the compartment 9 shared, which she crosses. The snail 2 in turn, extends through a neck-shaped recess 11 whose end is a thickening 12 which is exactly in the double opening of the mouth 10 can protrude. When the snail 2 In working position to effect lifting, it rests against the mouth 10 of the subject 4 , and her neck-shaped recess 11 crosses the compartment 9 of the rider 8th ,

cut A shows the interior of the compartment and illustrates the just described facts.

Around the thickening of the neck-shaped To move recess through the thighs of the rider is one Axial force necessary, which gets the screw, if they over the Wheel pulls when this is blocked. That leads to a moment that's up the wheel acts in the direction of lowering. Because of that Screw does not retract into its cylindrical compartment, the rigid ones Anchoring of the blind before the further blockade of the Operation limited compressed.

The Adaptation of the gearbox to a roller shutter, its roller shutter track or Behang is hooked with elastic anchors takes place simply by removing the rider from his compartment. In this case, the screw is not prevented from getting into Direction of the threaded compartment of the housing to move, these Movement takes place as soon as the screw is made to a to become active drive element, although it finds no support, in order to do this.

Braking, which prevents the spontaneous rotation of the control of the transmission under the influence of the torque generated by the suspended hanging, can be done as follows. The estuary 13 coming from the threaded compartment 6 of the housing 1 leads out, has a sleeve 14 with a double edge, these edges being on either side of said mouth 13 are positioned. One in the opening of the sleeve 14 placed ring 15 made of an elastic material wedged between the sleeve body and the wall of the housing 1 that the mouth of the mouth 13 surrounds. The sleeve 14 is from the tax bar 7 traversed and taken with its rotational movement, since its central recess to the cross section of this rod 7 equivalent. Taking into account the hardness of the material of the ring, it is ensured that the space it has between the wall of the opening and the sleeve body creates a tension sufficient to absorb the maximum retrograde moment transmitted from the wheel to the control rod become can. In a toric ring in the wall of the opening, a V-shaped notch can be incorporated, so that the pressure on the ring can be increased.

Further Below, another method for braking the worm is presented are also applied to this first embodiment of the transmission can be.

In the variant according to 2 a certain displacement direction of the curtain is always determined by a particular direction of rotation of the transmission, the arrow on the wheel 3 represents the lifting direction.

In this variant, there is the threaded section of the screw 2 in a compartment 16 of the housing 1 that they accurately fit, so they are no longer tangential to the wheel 3 can move. The snail 2 lengthens with a non-threaded section 17 into a secondary compartment 18 next to her main subject 16 , wherein a groove 19 in this section of the screw 2 a circular rib of the housing accommodates the separation of the compartments 16 . 18 features. The snail 2 and their extension 17 have a traversing bore through which the control rod 7 can be passed through, which remains independent with respect to its rotational movement. The transmission of the moment takes place by a cylinder 20 with edge 21 who is in secondary subject 18 is located, with the edge 21 this cylinder 20 the extension 17 the screw 2 Opposite and cooperates with it to create a barrier 22 to form with radial toothing. In the cylinder 20 There is a recess whose cross section is the cross section of the control rod 7 corresponds that crosses them. This cylinder is made using a spring 23 against the serrated end of the snail 2 pressed.

The direction of rotation of the control rod 7 that according to the cylinder 20 the snail 2 positively drives, is clearly the lifting, and the direction in which the cylinder 20 repeatedly on the control rod 7 slides, because the lock 22 has solved, that is the descent.

By changing the pressure exerted by the spring on the barrier, the transmission is adaptable to the requirements of the various shops. To do this, the tray becomes 18 in which the cylinder is 20 with his pen 23 located, with a threaded plug 24 locked. This plug 24 has a central recess, the cylinder extension of the cylinder 20 picks up and directs. By more or less deep screwing this plug, the spring is compressed or relaxed, which causes the lock is released at different strong moments.

Besides, they are the moment strengths by removing the plug and replacing the spring with a others, stronger or weaker ones Spring changeable.

Now should be considered the means by which the process in this embodiment the gearbox becomes irreversible.

In contrast to the first embodiment, this variant can only work if the brake is independent of the worm itself. Since this is namely permanent and the load of the curtain depending on how far it was unrolled, variable, can not be lowered with braked screw, as the lock would solve immediately and the curtain would remain rolled up. Because of this, the case faces 1 a third compartment 25 on that is in the axis of the other two subjects 16 . 17 located in which is a metal cylinder 26 located by a spring 27 is surrounded with a square wire, which has only a few joints not juxtaposed turns, which is the cylinder 26 radially expands to produce rotational friction. Just this cylinder 26 becomes according to its axis by the control rod 7 crosses and one end of the spring 27 is from the case 1 held, the other end is free and finally on the cylinder 26 is applied. The result is between the spring and the cylinder, a "Spille effect", which causes one of the directions of rotation of the cylinder is strongly braked and the other very little.

Of course, the most braked direction of rotation of the rod is the one that controls the lowering, so when looking from the point of attachment of the spring 27 on the housing 1 goes out, the spring 27 on the cylinder 26 must be rolled up by turning around in the same direction as this cylinder 26 turns when the transmission causes the lowering.

As already mentioned above, This braking method can also be applied to the claimed embodiment be applied. Although this is more expensive than the one described first, technically but superior, since it does not affect the lifting, the first method is independent of the direction of movement acts.

Finally done a summary of the properties of a transmission according to the invention and their consequences.

This gearbox automatically marks the end of the downward run if one of the following events occurs:
Either, the omission of the moment on the wheel, or the emergence of a moment, which is opposite to the moment, that of the normal Be hang suspension is generated. It has a means for rapid adaptation, which causes a triggering of the end position as a result of one or the other selected event. For this reason, it fits all stores, with their anchorages can be both elastic and rigid.

Of the embodiment According to the transmission, the end position when lowered by a Blockade of the operation marked, whereby this blockade takes place, without the force for the parts they need to pick up to multiply.

The Part that transmits the rotary motion of the control rod shifts according to the axis of this Stabs, after lowering the blind, without imme- diately during its movement to be disabled.

Finally, with this gear ordinary rigid anchors are used, which effectively prevent that the web or the curtain is raised directly. The connection This anchorages with the roll-up is usually done by screwing in perforations made in accordance with a special generatrix of the pipe are arranged, or on nuts, which slide in a groove. Since the release of the end position by compression the anchorages is effected, is the end position of this generatrix always optimal, so that the attachment of the anchorages is not set must become.

Claims (7)

Compact housing ( 1 ), having a gearbox which is intended to drive a roller shutter and which works on the principle of a driven by a tangential worm gear, wherein the wheel ( 3 ) and the snail ( 2 ) in the housing ( 1 ), wherein the roll tube of the roller shutter is connectable to the wheel, wherein the rotation of the screw is controllable by a rod connected to a crank, and when the screw ( 2 ) and thereby drives the lowering of the shutter and the wheel ( 3 ) encounters an obstacle to turn in that direction, the snail ( 2 ) then displaced according to its axis, characterized in that such a displacement of the screw ( 2 ) in the direction of a compartment ( 6 ) of the housing ( 1 ) takes place, in which, when the screw ( 2 ) has reached the bottom thereof, whose rotation is also blocked. Housing according to claim 1, whose screw ( 2 ) is driven by a continuous control rod, characterized in that the inclusion of the screw ( 2 ) in the housing ( 1 ) two communicating compartments ( 4 . 6 ), a cylindrical compartment ( 4 ), in which the snail ( 2 ), if it is there, can rotate freely in the two directions, the other tray ( 6 ) is threaded in such a way that it forms a non-piercing nut, in which the on the control rod ( 7 ) sliding screw ( 2 ), when the rod ( 7 ) causes the lowering and the wheel ( 3 ) encounters an obstacle to turn in that direction. Housing according to claim 2, characterized in that, when it turns while causing it to be lowered, the screw ( 2 ) in the cylindrical compartment ( 4 ) is held back by a means that releases it when the wheel is locked ( 3 ) on the snail ( 2 ) applied moment exerts on this a sufficient axial force. Housing according to claim 3, characterized in that the screw ( 2 ) a neck-shaped recess ( 11 ), which in a thickening ( 12 ), wherein the recess ( 11 ) between the two thighs of an elastic rider ( 8th ), which is releasable and replaceable, without the housing ( 1 ), this tab ( 8th ) forms the means by which the screw ( 2 ) detachable in the cylindrical compartment ( 4 ) is withheld. Housing according to claim 1, characterized in that a braking device ( 14 . 15 ; 26 . 27 ), which counteracts the static moment due to the weight of the suspended track, independently of the worm ( 2 ) and directly on the control rod ( 7 ) acts. Housing according to claim 5, characterized in that the braking device consists of a sleeve ( 14 ) with double edge and a ring ( 15 ) consists of an elastic material, wherein the sleeve ( 14 ) in an opening ( 13 ) of the housing ( 1 ) is inserted through which the control rod ( 7 ) running the sleeve ( 14 ) rotates, wherein the edges of the sleeve ( 14 ) the side of the opening ( 13 ) of the housing ( 1 ), the ring ( 15 ) in turn between the body of the sleeve ( 14 ) and the inner wall of the opening ( 13 ) is compressed. Housing according to claim 5, characterized in that the braking device is a spring ( 27 ) with a few turns, which with one of its ends with the housing ( 1 ) connected to a metal cylinder ( 26 ), this cylinder ( 26 ) of the control rod driving its rotation ( 7 ) is crossed.